The synthesis of calcium carbonate microparticles with multiple morphologies through self-assembly method

• A facile method was used to synthesize these different kinds of microparticles.
• The formation process of the F-calcium was recorded through the SEM images.
• The formation mechanisms of these microparticles were discussed.
• These mechanisms might be used to fabricate other microparticles.

Taking advantage of the biocompatibility and biodegradability of calcium carbonate, a simple method was introduced to synthesize the calcium carbonate microparticles with different morphologies, including hollow (H-calcium), flower-like (P-calcium) and peanut-like (P-calcium). The possible formation mechanisms of these kinds of calcium carbonate microparticles were discussed in this study. Initially, the aminopropyltriethoxysilane (APTES) was possibly hydrolyzed, and octa(amino-propylsilsesquioxane) (R-NH3+) was obtained. The R-NH3+ might guide the CaCO3 nanoparticles to form multiple calcium carbonate microparticles in aqueous phase because of their positive potential. Furthermore, the final treatments were very essential to obtain the calcium carbonate microparticles with satisfactory shape with this method. The XRD and FTIR results revealed the components and crystalline phase of these products. The morphologies were characterized by SEM and TEM. Furthermore, the potential value of these kinds of microparticles was discussed.

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